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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67c02dc72ec498ecee71cdf277e6cffb8c921c57f480d7a6461a90efc1b029fe' 
  AND token = 'ZK50RaJPO59RaN5ZRn2X4G2OOk/eJ9aWj+kHsRY5wuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}